Ram
About the Ram PCB
Ram is an open source PCB design by MichaelBell, published on GitHub under the BSD-3-Clause license. It is a 4-layer board measuring 84 × 40 mm, with 10 components from 7 distinct parts.
Other key parts include the IS66WVE4M16EBLL-70BLI, 74LVC32 and 74LVC2G04. By type, the board carries 4 capacitors, 3 ICs and 3 connectors.
From the project
RV4028 - A hackable Risc-V computer
RV4028 is intended to be a modular Risc-V computer, similar to the excellent RC2014 Z80 homebrew computer.
The idea is to create a minimal Risc-V system that is easy to understand and extend.
The inspiration for this came from @theJPster's post.
All hardware and software are open source and permissively licensed.
The system bus has a 32-bit address and 16-bit data, which fits reasonably well with an RV32 system and readily available (P)SRAM chips, and runs at 3.3V.
Main components on the Ram
Ram bill of materials (BOM)
10 components, 7 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | IS66WVE4M16EBLL-70BLI | BGA48C75P8X6_800X600X120N | U1 |
| 1 | 74LVC32 | SSOP-14_5.3x6.2mm_P0.65mm | U2 |
| 1 | 74LVC2G04 | SOT-363_SC-70-6 | U3 |
| 1 | ~ | Module_2mm | J1 |
| 2 | Conn_01x03 | PinHeader_1x03_P2.54mm_Vertical | J2, J3 |
| 3 | 100n | C_0402_1005Metric | C1, C2, C5 |
| 1 | 1u | C_0603_1608Metric | C3 |
Ram design files
The KiCad project lives in the MichaelBell/RV4028 repository on GitHub; these links point at the commit this page was built from.
- Layoutram/ram.kicad_pcb
- Schematicram/ram.kicad_sch
Ram: common questions
How big is the Ram PCB?
The Ram measures 84 × 40 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Ram?
10 components, from 7 distinct parts. The full bill of materials is listed on this page.
Where can I download the Ram design files?
From the MichaelBell/RV4028 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Ram design in my own project?
Yes, under the terms of its BSD-3-Clause license, which MichaelBell chose for the repository.
